feat: Implement client authentication and pre-fill functionality

- Added AuthController for client login and token management.
- Introduced AuthGate for handling authentication state and login UI.
- Updated API to support fetching client data for pre-filling forms.
- Modified App.vue to pre-fill client information if logged in.
- Enhanced client model to include username and password fields.
- Created migration for adding username and password to clients table.
- Added utility for generating secure usernames and passwords.
- Updated frontend to handle client tokens for pre-filling checkout forms.
- Removed old CSS file and updated HTML references to new assets.
- Added StatsOverview widget for displaying client and quote statistics.
- Improved error handling and user feedback in the login process.

backoffice/app/Models/Cliente.php

@@ -4,16 +4,28 @@ namespace App\Models;
 
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\HasMany;
+use Laravel\Sanctum\HasApiTokens;
 
 class Cliente extends Model
 {
+    use HasApiTokens;
+
     protected $table = 'clienti';
 
     protected $fillable = [
+        'username', 'password',
         'nome', 'cognome', 'ragione_sociale', 'email', 'telefono',
         'indirizzo', 'cap', 'citta', 'provincia', 'note',
     ];
 
+    protected $hidden = [
+        'password',
+    ];
+
+    protected $casts = [
+        'password' => 'hashed',
+    ];
+
     public function preventivi(): HasMany
     {
         return $this->hasMany(Preventivo::class);
@@ -25,6 +37,8 @@ class Cliente extends Model
             return $this->ragione_sociale;
         }
 
-        return trim("{$this->nome} {$this->cognome}");
+        $nome = trim("{$this->nome} {$this->cognome}");
+
+        return $nome !== '' ? $nome : $this->username;
     }
 }